1911-12.] BOTANICAL SOCIETY OF EDINBURGH 35 



A. (1) Fucaceaa association ; F. vesiculosus (with bladders 

 where on creek sides) dominant. 



(2) Plant societies of — 



(a) F. serratus. — Common. 



(b) F. spiralis. — Near H.W.M. ; scarce. 



(c) Pelvetia canaliculata. — In honeycombed rocks 



near H.W.M. ; scarce. 



(d) Enteromorpha compressa. — Abundant; due to 



sewage. 



(e) Laminar ia dig itata,L. Saccliarina,axi& Chondrus 



crispus in tidal pools. 

 (/) Ceranium rubrum (pale brown), and Entero- 

 morpha compressa (colourless), in, and due to 

 high stagnant pools. 



B. (1) Fucaceae association; F. vesicidosus and F. ser- 

 ratus dominant. 



(2) Plant societies of — 



(a) Ascophyllum nodosum. 



(b) Callithamnion scopulorum and Gigartina 



mamillosa. — Abundant as a lower storey on 

 sea-wall between H.W.M. and half -tide mark. 



(c) Chylocladia articulata and Gigartina mamillosa. 



— Abundant as lower storey on sea-wall 

 between half -tide mark and L.W.M. 



(d) F. spiralis. — Near H.W.M. ; scarce. 

 Indubitably supporters of the view that this terminologj^, 



as applied to marine Algae, is capable of improvement, will 

 not be lacking. 



The writer, however, ventures (with all due modesty) to 

 suggest that the value of the suggestion lies in the fact 

 that, if acted upon, the study of Algae from the present 

 standpoint will be brought into unity and conformity with 

 existing methods of phytogeographical terminology. 



LITERATURE. 



(i) Warming, E., assisted by Vahl, M. — (Ecology of Plants : an 

 Introduction to the Study of Plant-Communities. Oxford, 1 909. 



(2) Borgesen, F.— The Algae Vegetation of the Faeroese Coasts, 



with Remarks upon the Phytogeography. 1905. 



(3) Moss, C. E. — The Fundamental Units of Vegetation ; reprinted 



from New Phytologist. 1910. 



